Strap fastener



FIG. 1 is a bottom view of a strap fastener showing my new design;

FIG. 2 is a top view of the strap fastener;

FIG. 3 is a front view of the strap fastener;

FIG. 4 is a rear view of the strap fastener;

FIG. 5 is a left side view of the strap fastener;

FIG. 6 is a bottom perspective view of the strap fastener; and,

FIG. 7 is a top perspective view of the strap fastener. 

The ornamental design for a strap fastener, as shown and described. 